Studies on the Constituents of Quercus spp. VI. Triterpenes of Quercus glauca THUNB., Structure of Cyclobalanone
1976; Pharmaceutical Society of Japan; Volume: 96; Issue: 10 Linguagem: Inglês
10.1248/yakushi1947.96.10_1207
ISSN1347-5231
AutoresYoshiaki Kamano, YASUHIDE TACHI, Jiro Sawada, Ichiro Tanaka,
Tópico(s)Plant biochemistry and biosynthesis
ResumoThe two triterpens, β-amyrin acetate and lupeol, were isolated from the leaves of Quercus glauca THUNB. (=Cyclobalanopsis glauca QERST.). An unidentified triterpene, E-6, was found to be a mixture of two triterpenes, I (major) and IX (minor), by the gasliquid chromatographic determination, and these compounds were separated by silica gel column chromatography. Triterpene I (C32H52O, mp 187-190°) is a new triterpene and was named cyclobalanone. Its structure was determined to be 3-oxo-24, 24-dimethyl-9, 19-cyclolanost-25-ene from its chemical reactions and by a physico-chemical method. Triterpene IX was identified as the known 24-methylencycloartanone.
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